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Journal Article
Research Support, Non-U.S. Gov't
Population identification and divergence threshold in Psoroptidae based on ribosomal ITS2 and mitochondrial COI genes.
Parasitology Research 2015 September
Psoroptidae mites are a type of small mites with a wide range of hosts. The proliferation of Psoroptidae mites could cause symptoms such as severe itching, atopic dermatitis, and hair loss in infected animals. If severely infected, death can also occur. The morphological classification and identification of Psoroptidae mites is problematic due to the overlapping geographical distribution. In addition, there is no divergence threshold for molecular classification and identification. To solve this problem, gDNA was extracted from individual Psoroptes and Otodectes mites (China) for amplification of rDNA ITS2 and mtDNA COI. After that, the sequences obtained were aligned and analyzed with those retrieved from GenBank. Based on rDNA ITS2 sequences, Psoroptidae was divided into three genera, namely, Psoroptes, Chorioptes, and Otodectes, which was in accordance with morphological classification. The intraspecies, interspecies, and intergenera could be differentiated effectively, with thresholds ≤ 5.20, 6.18-14.86, and ≥15.72 %, respectively. However, based on mtDNA COI sequences, Psoroptidae was divided into four genera with Caparinia added, as Caparinia sp did not cluster with the other three genera. The intra- and interspecies could be differentiated effectively, but interspecies and intergenera could not. The intra- and interspecies identification thresholds were ≤ 2.12 and ≥10.93 %. Further analysis showed that host but not geographical isolation was found in Psoroptes and Chorioptes, whereas Otodectes mites parasitizing dogs and cats were the same species; neither host nor geographical isolation was observed. In conclusion, rDNA ITS2 is better than mtDNA COI for DNA barcoding in Psoroptidae.
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